Film-stopping device



April 28, 1931. K MORSBACH 1,803,271

FILM STOPPING DEVICE Filed March 9. 1929 2 Sheets-Sheet l- April 28,1931.

K. MQRSBACH FILM STOPPING DEVICE 2 Sheets-Shed 2 Filed March 9, 1929 hgaPatented Apr. 28, 1931 UNITED STATES PATENT OFFICE KURT OF BEBLIN-LICHTERIELDE GERMANY, ASSIGNOR, BY MESNE AS- SIGNMENTS, '10 PROJEC'I'OR G.M. B. BL, OF BERLHV, GERMANY, A CORPORATION OF GEBIAN'Y Applicationfiled larch 9, 1929, Serial No.

' The present invention relates to a device for stopping theintermittent movement of the film through a film projecting apparatus bythe use of which it is possible to suspend the operation of the feedingmechanism of the film band at any movement as required, so that anyparticular film picture can be held stationary on the projection surfacefor the purpose ofclose examination, I

Qne object of my invention is, by means of a single releasing device onthe one hand to draw back the gripping pins (which serve to move thefilm band intermittently through the gate) so far that they no longerextend 'into the path of the film, and on the other hand simultaneouslyto cut out the driving mechanism, the film winding and unwindingmechanism, and also the feeding drum. The withdrawal of the grippingroller is effected by a lever which moves the main shaft in an axialdirection. This movement is rendered possible by the fact that,according to this invention, the drive is transferred from the mainshaft to the feeding-roller and to the film winding and unwindingmechanism by means of a worm.

Another feature of my invention is, that by means of this spiral screwthe feeding and gripping devices are caused to return automatically oncemore to their working positions by the axial thrust of the worm, as soonas the releasing device, which serves to release the feeding andgripping devices, ceases to. function.

A further feature of my invention is that simultaneously with themovement of the main shaft and the withdrawal of the gripping pins fromthe film band caused thereby,

' a coupling is disconnected by the action of a second lever operated bythe releasing device, which coupling is integral with the drivingmechanism of the-feeding-roller and the film winding and unwindingmechanism.

All these objects and features and certain other features of myinvention relating to the construction, combination andvarrangement ofparts will be more fully understood from the following detaileddescription of a typical form of the invention throughout FILM-STOPPINGDEVICE 845,848, and in Germany'l'anuary 4, 1927.

which description reference is had to the accompanying drawings, inwhich:

1 is a longitudinal section of a projectlon apparatus with the stoppingdevice that forms the subject of this invention.

Fig. 2 is the stopping device of Fig. lon a the projection apparatus, inthe lower part 2.

of which the film is lodged; The drive of the apparatus is efiectedeither by a motor, not shown In the drawings, which revolves the beltpulley 3 of the main shaft 4, or b means of a crank handle 5 which isfitted to the shaft 6 of the worm wheel 7 which latter cooperates withthe spiral screw 8. The main shaft 4 is adjustably housed on one sideinsupports 9 and on the other side in a socket 10 which is fitted. tothe front of the film channel 11. On the main shaft 4 are arranged onebehind the other, a fly wheel 13 fitted with screening wings 12, a metaldisc 14 which is bent in two planes, and an eccentric disc 15. Byrotating the eccentric disc 15, a frame 16 is moved up and down, and inthe lower part of this frame gripping pins 17 are movably secured. Thegripping pins ,l7have at their ends a fork 18, in the slot of whichengages the metal disc 14 which is bent in two planes, and by this meansthe gripping pins 17 are given a horizontal backward and forwardmovement. The drive for the feeding drum 19 and the film winding andunwinding mechanism 20 passes from the spiral screw 8 over the wormwheel 7 to the worm wheel 21, which latter runs freely on the shaft 22.The latter carries at one end the feeding-roller 19, which is wedgedtightly'to it. The worm wheel 21 is provided with a pin 23, placedlaterally, which, when coupled, engages in one of the holes 24 in thebelt pulley 26 which serves to drive the belt 25 and thus the filmwinding and unwinding mechanism. The belt pulley 26 is fastened. tospool 27 The latteris supplied with a slot 28 by means of which a pin 29passes through the shaft 22 housed inside the spool. Between'the pin 29and the belt pulle 26 a spring is placed around the outside 0 thespool27, the function of which is to engage thecoupling pin 23 in one ofthe holes 24 of the belt pulley 26. At the end of the spool 27 is aflange 31 against which rests a lever 32 which is rotatably fitted. tothe pivot 33. Theend 32 of'the lever protrudes through a slot 34 of thecarrier plate 35. On the carrier plate 35 is movably fitted a push rod36 in guides 37 in such a manner that its foremost end comes intocontact with'the end 32' of lever 32. At its side is the push rod 36,which is provided with a rojection 38, against which one arm of a dou 1earmed lever 39 bent at right anglesbears. The ,lever 39 is rotatablysecured to the carrier plate 35 by means of a pivot 40. To .the otherarm of the lever 39 1s joined a tension rod 41, which in its turn isconnected with a vertical double-armed lever 42. The lever 42 isrotatable about the pivot 43, while its upper end 42' bears againstflange 44, which latter is secured to the main driving shaft. The modeof operation of the device is as follows In normal working, i. e. whenthe stopping device is not functioning, by the rotation of the mainshaft 4 on the one hand the gripping device is displaced to carry thefilm hand through the gate, and on the other handthe feeding-roller 19and the film winding and unwinding mechanism 20 are kept in continuousrotation. In this way the drive for the feeding drum 19 is transmittedthrough the spiral screw 8 on the worm wheel 7 and thence through theworm'wheel 21 by means of the coupling pin 23 on the belt pulley 26.-The belt pulley 26 drives the spool 27, and this in turn, by means ofthe pin 29, drives the shaft 22 of the feeding-roller 19. The drive forthe film winding and unwinding mechanism is supplied by the belt pulley26, As soon as the push rod 36 is pressed inwards, the gripping device,the feeding-roller and also the film winding and unwinding mechansm 20are put out of the operation. By pressing the rod 36, the stop 38 isforced agamst the lever 39, so that the latter rotates about its pivot40, and the upper part 42. of the lever 42 is thus pressed against theflange 44 of shaft 4, so that the latter is forced backwards. The shaft4 takes the disc 14 with it, so that gripping pins 17 are drawn back sofar that they can no'longer engage in the film channel 11.Simultaneously with the action of the lever 42, the lever 32 is, bypushing rod 36 forwards, rotated about its pivot 33, in such mannerthat, in consequence of its ressure against the flange 31, the spool 27an with it is disengaged from the holes 24, so that the A Worm wheel 21revolvesfreely on the shaft 22 and no longer takes with it the beltpulley 26 and the shaft 22. Thus in this manner the gripping device, thefeeding drum 19, and

the film winding and unwinding mechanism 20 are put out of operation. Assoon as the pressure is released from the push rod, the gripping deviceand the film feedingmechanism once more come au matically intooperatiton by means of the axial pressure of the spiral screw 8, ofwhich the function is to, move the shaft 4 back into its operativeposition. This effect of the axial thrust of the spiral screw 8 isstrengthened by the sprin 30. In spite of the sudden switching out o thegripping device and the film wind-.

ing and unwinding mechanism, no acceleration in the speed of the motoroccurs, as the fractional action of the levers 32 and 42. caused by thespiral pressure, against the flanges 31 and 34 is substantially equal tothe force of the drive necessary for the mechanisms which have been putout of operation.

As can be seen from the preceeding description, by 'the forward movementof the push rod 36 it is easilypossibleto put the gripping device andthe feeding mechanism out of operation, while the rest of the mechanismcontinues in motion, so that any desired picture ofthe film'band canbeviewed aslong as desired in a stationary position on the projectionsurface.

I claim:

1. In a film stopping device for stopping the intermittent movement ofthe film through a film projecting apparatus a push rod, an angle-leverone end of which engages a lateral projection of the push rod, apivotally mounted lever one end of which is connected with the other endof the angle-lever by-means of a tension rod, the other end of v thepivotally mounted lever being pressed against a flange of theconstinuously rotating mainshaft and axially shifting the same when thepush rod is operated, gripping pins which are operated by the main shaftby means of a cam disc arranged thereon and -which are'retractedtogether with the driving shaft as to prevent them from engaging thefilm, and a spiral screw on the main shaft engaging a continuosulyrotating wormwheel which drives the feeding and the winding andunwinding mechanism bymeans of a cou ling disconnected when the mainshaft is axlally shifted, the axial thrust of the spiral screw returningautomatically the main shaft to its operative position when the push rddceases to operate.

2. In a film stopping device for stopping the intermittent movement ofthe film the belt pulley 26 act against the action of the through a filmprojecting apparatus a push spring 30 on the shaft 22, which movement isrendered easily possible by the formation rod, an angle-lever one end ofwhich engages a lateral projection of the push.rod,'a pivo- 35 of theslot 28. By this movement, the pin 23 tally mounted lever one end ofwhich is connected with the other end of the angle-lever by means of atension rod, the other end of the pivotally mounted lever being pressedagainsta flange of the continuously rotating main shaft and axiallyshifting the same when the push rod is operated, gripping pins which areoperated by the main shaft by means of a cam disc arranged thereon andwhich are retracted together with the driving shaft as'to prevent themfrom engaging the film, a spiral screw on the main shaft engaging acontinuousl rotating 7 worm wheel which drives the eeding and thewinding and unwinding mechanism by means of a coupling and a leverengaging the push rod and disconnecting the said coupling when the mainshaft is axially shifted, the axial thrust of the spiral screw returningautomatically the main shaft to its operative position when the push rodceases to operate.

3. In a film stopping device for stopping the intermittent movement ofthe film through a film projecting apparatus a push rod, an angle-leverone end of which engages a lateral projection of the push rod, apivotally mounted lever one end of which is connected with the other endof the angle-lever by means of a tension rod, the other end of thepivotally mounted lever being pressed against a flange of thecontinuously rotating main ,shaft and axially shiftin the same when thepush rod is operate gripping pms which are operated by the main shaft bymeans of acam disc arranged thereon and. which are retracted togetherwith the driving shaft as to prevent them from engaging the film, aspiral screw on the main shaft engaging a continuously rotating wormwheel, a transmission worm wheel engaging the other worm wheel andrevolving freely on a spindle, a coupling pin placed aterally on thetransmission worm wheel, a belt pulley provided with holes for theengagement of the coupling pin, a spring pressing the belt pulleynormally into engagement with the coupling pin of the transmission wormwheel, and a lever engaging the push rod and disconnecting the couplingof the transmisslon worm wheel with the feeding and the wind- I ing andunwinding mechanism when the main shaft is axially shifted, the axialthrust of the spiral screw returnin automatically the main shaft to itsoperative position when the push rod ceases to operate. I 55 4. In afilm stopping device for stopp ng the intermittent movement of the filmthrough a film projecting apparatus a push rod, an angle-lever one endof which engages alateral projection of the push rod, a p1v-' otallymounted lever one end of which is connected with the other end of theanglelever by means of tension rod, the other end of the pivotallymounted lever being pressed against a flange of the continuouslyrotating 6 .main shaft and axially shifting the same when the push rodis operated, gripping pins which are operated by themain shaft by meansof a cam disc arranged thereon and which are retracted together with thedriving shaft as to prevent them from engaging 10 the film, a spiralscrew on the main shaft engaging a continuously rotating worm wheel, atransmission worm wheel engaging the other worm wheel and revolvingfreely on a spindle, a coupling pin placed laterally on the transmissionworm wheel, a belt pulley provided with holes for the engagement of thecoupling pin and fixed on a spool axially slidable on the spindle andtransmitting its rotation to the spindle, a spring pressing the beltpulley normally into engagement with the coupling pin of thetransmission worm wheel, a feeding drum wedged tightly to the spindle, afilm winding and unwinding mechanism driven by the belt pulley, and alever engaging the push rod and the spool, constraining the said springand disconnecting thus the coupling pin and the belt pulley when themain shaft is axially shifted, the axial thrust of the spiral screwreturning automatically the main shaft to its operative position whenthe push rod ceases to operate. 5. A film feeding device for moving afilm through a film projecting apparatus, comprising in combination, acontinuously rotating and axially shiftable main shaft, gripping pins,-a cam on the main shaft for oper- 'ating said pins, means to yieldinglyhold said pins in operative position, film feeding mechanism, couplingmeans for transferring drivmg action from the main shaft to the filmfeeding mechanism, means to yieldingl hold pling means.

6. A film feeding device for moving a film through a film projectingapparatus comprising in combination, a continuously rotating and axiallyshiftable main shaft, gripping pins, a cam on the main shaft foroperating said pins, a spiral screw on the main shaft engaging acontinuously rotating worm wheel, film feeding mechanism, said wormwheel adapted to drive the film feeding mechanism through a couplingyieldingly held in operative relation, and a releasing device adaptedsimultaneously to axially shift the main shaft together with the camthereon against the axial thrust of the spiral screw on the shaft tomove the gripping pins from operative position, and to disconnect saidcoupling means.

lin testimony whereof, I afiix my signature.

' KURT MORSBACH.

